27.12 MHz in the ECX-32 low-profile package
The ECS-271.2-8-33-AGM-TR: Load capacitance is specified at 8 pF, which means the Pierce oscillator circuit driving this crystal must account for the crystal's own load requirement — the external capacitors on each crystal leg should be selected to present roughly 8 pF net at the crystal pins once stray board capacitance is included.
Frequency tolerance, stability, and ESR
Total frequency accuracy at room temperature is ±25 ppm (tolerance), while the drift budget over the full operating temperature range of -20°C to 70°C is ±30 ppm (stability). For a 27.12 MHz crystal, that ±25 ppm tolerance window translates to a deviation of roughly ±680 Hz at the output frequency — tight enough for UART clocking and many embedded MCU PLLs, but designers using this as a precision reference should verify the combined tolerance stack against their timing budget. Equivalent Series Resistance is 40 Ω — higher than the sub-10 Ω typical of low-ESR TCXO or SAW-referenced oscillators, which is normal for a fundamental-mode AT-cut quartz blank in this package size. The Pierce oscillator start-up gain must be sufficient to overcome this impedance; microcontroller families with weak oscillator drive may need external seed resistors or a lower-gain oscillator configuration to guarantee start-up across temperature.
Packaging and storage considerations
Supplied on Tape & Reel with Cut Tape as an option, this part ships in the moisture-barrier bag the manufacturer specifies for surface-mount devices — the ECX-32 series is moisture-sensitive, and dry storage or a prebake step before reflow is a handling decision the assembler makes based on the incoming moisture sensitivity level and the board assembly profile.